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strings_and_languages [2012/09/19 16:55] vkuncak |
strings_and_languages [2012/09/19 16:56] vkuncak |
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Similarly, $L \cdot \emptyset = \emptyset$. | Similarly, $L \cdot \emptyset = \emptyset$. | ||
- | Of course, $\{ w_1 \} \cdot \{ w_2 \} = w_1\cdot w_2$. | + | Also directly from definition follows: |
+ | \[ | ||
+ | \{ w_1 \} \cdot \{ w_2 \} = \{ w_1\cdot w_2 \} | ||
+ | \] | ||